Leaflet

OL-11615-01

Figure 5 Catalyst 4500 CoPP

Contrary to the Catalyst 6500, Catalyst 4500's CoPP supports the definition of non-IP traffic classes in

addition to IP traffic classes. With this, instead of using the default class for handling all non-IP traffic,

you can define separate policies for non-IP traffic. This results in better and more granular control over

non-IP protocols, such as ARP, IPX, BPDUs, CDP, and SSTP.

As in other platforms, CoPP uses the modular QoS command-line interface (MQC) to define traffic

classification criteria and to specify the configurable policy actions for the classified traffic. MQC uses

class maps to define packets for a particular traffic class. After you have classified the traffic, you can

create policy maps to enforce policy actions for the identified traffic. The control-plane global

configuration command allows the CoPP service policy to be directly attached to the control plane.

One particular characteristic of Catalyst 4500's CoPP is that the CoPP policy must be named system-cpp

policy. In fact, system-cpp-policy is the only policy-map that can be attached to the control-plane. To

facilitate the configuration of the system-cpp-policy, Catalyst 4500's CoPP provides a global macro

function (called system-cpp) that automatically generates and applies CoPP policies to the control-plane.

The resulting configuration uses a collection of system defined class-maps for common Layer 3 and

Layer 2 control-plane traffic. The names of all system defined CoPP class maps and their matching ACLs

contain the prefix “system-cpp-.” By default, no action is specified on any of the system predefined

traffic classes.

Table 2 lists the predefined system ACLs.

190962

Switch CPU

Control and

CPU Bound

Traffic

DataTraffic

Ingress Control Plane

Forwarding ASICs

Linecard Linecard

16 CPU

Queues

Backplane

Ta b l e 2 Catalyst 4500 System Predefined ACLs

Pre-defined Named ACL Description

system-cpp-dot1x MacDA = 0180.C200.0003

system-cpp-bpdu-range MacDA = 0180.C200.0000 - 0180.C200.000F

system-cpp-cdp MacDA = 0100.0CCC.CCCC (UDLD/DTP/VTP/Pagp)

system-cpp-garp-range MacDA = 0180.C200.0020 - 0180.C200.002F

system-cpp-sstp MacDA = 0100.0CCC.CCCD

system-cpp-cgmp Mac DA = 01-00-0C-DD-DD-DD

system-cpp-ospf IP Protocol = OSPF, IPDA matches 224.0.0.0/24